Saw-guard



(No Model.)

J. G; GEOFF,

- SAW GUARD.

N0. 284,199. Patented Sept. 4,-1883.

WITNESSES J INVENTOR 7036/07? &.

35 I it is secured to the blade or shank B by rivets .Josnrn G. enorr, or oon-NEnsviLLn, INDIANA.

SAW-GUARD.

SPECIFICATION forming part of Letters Patent No. 284,199, dated'September 4, 1883.

1 Application filed April 12,1883. No model.)

To all whom it may concern.-

Beit knownthat I,' JosErn G. GROFF, of Connersville, inthecounty of Fayette and State of Indiana, have invented certain new and useful Improvements in Guards or Hoods for Circular Saws; andI do hereby declare the following to be afull, clear, and exact description of the same, reference being chad t the accompanying drawings, forming part of this specification, andto the figures and letters of reference marked thereon.

This invention relatesto that class of guards for circular saws which are automatic in their action, rising upon the approach of the material to be sawed, resting upon the material while being sawed, and dropping back upon or near to the surface of the table after the material has'passe'd' from under it, the saw being 7 all the while covered and theoperator proelected from accident.

I will first describe the construction of my improved saw-guard, and will then point out those particular features of it which I deem to be novel in view of the present advanced state of the art.

Referring to the Figure 1 re resents a side elevation of my invention. ig. 2 is an edge view of a portion of the device looking from the rear.

Similar letters of reference in the several figures denote the same parts.

A represents the hood or guard proper, provided at its front with an upwardly-projecting arm, a, and at. its rear with a downwardly-inclinednontinuation or extension, I), by which or equivalent fastenings, as shown. WVhen in normal position the forward end of the hood rests at 0 upon or is adjusted near to the top of the table, the bottom line of the hood, from 0 to 0, making an acute angle with the top of the table, and the lines 0 c and c d together making an obtuse angle, all as shown in Fig. 1.

The shank B consists of a metal blade rivetted to the extension of the hood proper, as before mentioned, and extending downward and .of the latter.

accompanying drawings,

accommodation of a grooved roller, T, mounted upon a pin or bolt between the socket-plates G G, and also for the accommodation of a crossrod, D, passing laterally through avertical slot, g, in the socket-plate O, and through one of a series of holes, 9, in the other of said socket-plates O, as shown in Fig. 2. The.

cross-rod D is provided witha guard or collar, h, which limitsthe extent to which the end of the rod can be inserted through the plates G O; and it is further provided with an annular recess or groove, 8, near its extreme inner end, at the point where it passes through, the hole in the plate 0, the edge of the opening in said plate 0 being adapted to engage with said groove when the rod is in position, so as to prevent the casual longitudinal displacement The shank of the rod extends to the side of the table, and is provided with a suitable handle, D, arranged in convenient reach of the operator. When the shank or blade B is slipped into the socket formed by the plates 0 0, its forward edge rests within thegroove of a flanged roller, 1", near the top of the socket, while against its rear edge presses a spring, m, preferably carrying a grooved roller m, and projecting forward from a support, a, as shown in Fig.1. Theflanged roller on the one side, and the spring, with orwithout its roller m, on the other side, assisted by the lower grooved roller, T, therefore serve to guide and steady the shank in its up and down movements. The shank, in addition to its capability of being moved up and down, has a limited back and forth'swinging motion upon the roller T as a pivot, the open ends of the socket and the slot in the bed-plate at e permitting of such motion. Rod D serves as the means for limiting the downward movement of the shank, and consequently the normal vertical position of the hood with respect to the table, for it is evident that by loosening the rod and adjusting it up or down in one or the other of the holes in socket-plate O the hood will be raised or lowered, and its lowest position with respect to, the table will be determined. This capability of adj ustment enables the hood to be so positioned as that the material to be sawed will be required to automatically raise it theminimum distance in passing under. Ordinarily I find it only nec I the rear of the hood. While the material raise the hood but a quarter of an inch.

clination of the shank or blade B, as well as essary to adjust the hood so that its forward end, at a, shall stand a quarter of an inch below the height or thickness of the material to be sawed. The material will then be required to The operation of the device will be apparent. The advancing material to be saweda board, for instancestrikes the upper arm, a, of the hood and raises the forward end of the hood, and at the same time causes the hood to swing backward slightly upon the roller T as a pivot, then, farther advancing, it strikes the downwardly-inclined extension I) and raises passes by the saw the hood rests upon it and remains there until the end of the board is reached, when the hood settles back to its normal position, its front end dropping back upon the table first, and then its rear end.

It will be observed that the backward inthat of the socket-plates G 0, enables the rear of the table to be raised or lowered without liability of the parts beneath the table coming in contact withthe saw.

Having thus described my invention, I claim as new 1. The hood having the forward upwardlyinclined extension against which the lumberv strikes to raise the front of the hood, and having the rearward and downwardly inclined extension against which the lumber strikes to raise the rear end of the hood, in combination with the blade or shank riveted to said extension, and the socket for the blade, substantially as described.

2. The combination of the hood, the depending shank or blade attached to the hood and slotted longitudinally at its lower end, the socket for receiving the shank or blade, and the cross-rod working in the slot, substantially as described, for the purpose specified.

3. The combination of the hood, the slotted working through the slot in the shank, and the spring bearing against the back of the shank and operating to keep the latter normally tilted forward, though adapted to yield when the shank is tilted backward, substantially as described.

5. The combination of the hood, the longi- .tudinally-slotted blade or shank attached to and moving with the hood, the socket for the shank, the cross-rod, the flanged roller at the front and the spring at the back of the shank, said roller and spring serving to keep the shank in proper position laterally while being tilted, substantially as described.

6, The combination of the hood, the slotte blade attached to and moving with the hood, the socket-plates, the cross-rod, and the grooved rolleron the crossro'd, said roller operating to assist in guiding the shank while being tilted, substantially as described.

JOSEPH G... GEOFF.

\Vitnesses:

HENRY LUKING, Orms. H. BROOKBANK. 

